CVE-2026-102823

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (16th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — Patch released this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Russh is a Rust SSH client and server library. Prior to 0.63.1, client_read_authenticated in russh/src/client/encrypted.rs forwards CHANNEL_DATA, CHANNEL_EXTENDED_DATA, CHANNEL_EOF, CHANNEL_CLOSE, CHANNEL_OPEN_FAILURE, CHANNEL_SUCCESS, CHANNEL_FAILURE, and CHANNEL_REQUEST subtypes exit-status, exit-signal, and xon-xoff to public client::Handler callbacks without confirming that the ChannelId belongs to a channel the client opened and established. A malicious SSH server can send lifecycle events for predicted, unopened, unconfirmed, or released channel identifiers, causing application panics or corrupting command completion and exit-code tracking. This issue is fixed in version 0.63.1.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
16th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

October 2, 2026

Advisory Details (3)

Auto-updated Sep 29, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

v0.63.1

Patch available: Eugeny/russh v0.63.1

https://github.com/Eugeny/russh/releases/tag/v0.63.1
github_commit Patch Available

commit 3430fd26ecaf (Eugeny/russh)

Patch available: Eugeny/russh v0.63.1 (contains commit 3430fd26ecaf)

https://github.com/Eugeny/russh/commit/3430fd26ecafc0dc3705210f5f39a9119fa22774
github Patch Available🟡 PoC Available

russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never opened · Advisory · Eugeny/russh · GitHub

https://github.com/Eugeny/russh/security/advisories/GHSA-47hw-gvq5-r2gm

Vendor Advisories for CVE-2026-102823(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatopenshell-main-0.1.2-0.2.hum12026-10-01redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFixed inDependents
russh—0.63.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 18× in last 7d / 18× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 10:39 UTCVendor advisory
  2. 2026-10-03 23:18 UTCEG score recompute
  3. 2026-10-03 23:18 UTCVendor advisory
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 11:57 UTCVendor advisory
  6. 2026-10-03 00:37 UTCEG score recompute
  7. 2026-10-03 00:37 UTCVendor advisory
  8. 2026-10-02 13:18 UTCEG score recompute
  9. 2026-10-02 13:18 UTCVendor advisory
  10. 2026-10-02 12:46 UTCEG score recompute
  11. 2026-10-02 12:46 UTCVendor advisory
  12. 2026-10-02 04:16 UTCEG score recompute
  13. 2026-10-01 19:49 UTCEPSS rescore
  14. 2026-09-30 18:00 UTCEG score recompute
  15. 2026-09-30 15:02 UTCEPSS rescore
  16. 2026-09-29 19:20 UTCEG score recompute
  17. 2026-09-29 18:29 UTCEG score recompute
  18. 2026-09-29 18:28 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same vendor + same CWE)

Same vendor

2 shown

redhat:RHSA-2026:74586

Frequently asked(5)

What is CVE-2026-102823?
CVE-2026-102823 is a high vulnerability published on September 29, 2026. Russh is a Rust SSH client and server library. Prior to 0.63.1, clientreadauthenticated in russh/src/client/encrypted.rs forwards CHANNELDATA, CHANNELEXTENDEDDATA, CHANNELEOF, CHANNELCLOSE, CHANNELOPENFAILURE, CHANNELSUCCESS, CHANNELFAILURE, and CHANNELREQUEST subtypes exit-status, exit-signal, and…
When was CVE-2026-102823 disclosed?
CVE-2026-102823 was first published on September 29, 2026, with the most recent update on October 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-102823 actively exploited?
CVE-2026-102823 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102823?
CVE-2026-102823 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-102823?
A fix for CVE-2026-102823 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-102823 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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